In the event that no burning fuel. To calculate the result at a pressure of 1 atmosphere or at 760 mmHg temperature 25° c, dry condition (Dry Basis) by volume oxygen. In real conditions, while exhaust measurements.
In the absence of combustion. To calculate the pressure of one atmosphere or 760 mm Hg at 25 ° C, dry conditions (Dry Basis) by volume of oxygen. In bad weather conditions prevailing in the measurement time.
In the absence of the fuel combustion, calculate the pressure 1 atmosphere, or 760 mmHg, temperature 25 C condition dry. (Dry Basis) by volume of oxygen in air condition true while measuring instrument